lib/strspn.c

   1 /* strspn.c -- return numbers of chars at start of string in a class
   2    Copyright (C) 1987, 1990 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #if defined(HAVE_STRING_H)
  23 #include <string.h>
  24 #else
  25 #include <strings.h>
  26 #ifndef strchr
  27 #define strchr index
  28 #endif
  29 #endif
  30
  31 int
  32 strspn (str, class)
  33      char *str, *class;
  34 {
  35   register char *st = str;
  36
  37   while (*st && strchr (class, *st))
  38     ++st;
  39   return st - str;
  40 }